I use the recommended Renata 2450N battery for my Power2Max and it’s worked well. Picked up their 2032 sized batteries as I’m finally through the cheapo Phillips bulk packing I bought years ago (they work fine in all the devices they fit in but run out of juice pretty fast). So far using the Renata in a garage door opener and the wife’s LED candles have yielded very good results.
Will eventually put fresh ones in my quarq and Garmin Ant+ sensors next (probably next spring most likely).